62% is the change from 50 to 81
Calculation steps:
[( 81 - 50 ) ÷ 50] x 100 = 62%
Formula
Percentage change = [(81 - 50) / 50] x 100
Subtract the new number by the original number
81 - 50 = 31
31 ÷ 50 = 0.62
0.62 x 100 = 62%
Example